Superheater



June 9, 1925 1,541,205

l J. E. BELL. l

SUPERHEATER Filed June 1'7I 1919 5 Sheets-Sheet 1 June 9,Y 1925.

J. E. BELL 'SUPERHEATER Filed June 1'7 1919 5 Sheets-Sheet 2 oonoocuoocoo o o c o o c e u o oooooooaoononnoo Jaim EBezzJfwen for June 9, w25. Y

J. E. BELL.

SUPERHEATER 5 shees-sheet s Filed June 17, 1919 John Eezz, @maar avy@ nfl/m1,

June 9, 1925.

J. E. BELL SUPERHEATE R Filed June 17,11919 5 SheetS-Shee(l 4 june 9, ZEL

J. E. BELL SPERHEATER Filed June l'I 1919 5 Sheets-Sheet 5 Patented June 9, 1925.

UNITED STATES l 1,541,205 PATENT OFFICE.

JOHN E. BELL, OF BROOKLYN, NEW YORK, ASSIGNOR TO POWER SPECIALTY COMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SUPERHEATER.

Application led June 1:7, 1919. Serial No. 304,775.

.To all whom z't may concern:

Be it, known that I, JOHN E. BELL, a citizen of the vUnited States, residing at Brooklyn, county of Kings, andl State of New York, have invented certain new and useful Improvements in Superheaters, of which the following is a full, clear, and ex act description.

As a general rule when a superheater is installed in a boiler it is intended to absorb as much of the furnace heat as possible, but there are practical limits tothe amount of such heat as'without special provision to prevent it the tubes would be yburned out by too excessive a temperature. In this respect superheater tubes differ from the boiler tubes, the water in which protects them against high radiant and conducted heat, and to safeguard superheaters it is usual to place them in such position that a safe proportion of the furnace heat will be absorbed by a part or all of the boiler tubes before it is reached by the hot gases.A

For this reason separately fired superheaters `are not as a rule economical, although in many cases they may be extremely desirable, as the heat is apt to be too intense and liable to burn outpthe tubes. This is 'particularly true of the radiant heat.

I have'discovered, and in a patent granted to me on March 11, 1919, No. 1,296,739, I have set forth a way to protect superheater tubes from excessive and radiant heat in a boiler by surrounding the tubes of the superheater with a heat conducting casing and exposing only so much of the latter to the action or effect of the radiantheat as will serve the purposes of a high degree of su erheat without endangering the tubes, an in my present application I shall show a means of utilizing this principle in the construction of a practicable and efficient form vof separately fired superheater, which enables` meto construct and use such a device to great advantage, a result which has not so far as I am aware been heretofore accomplished. y

According to my present invention I construct a furnace for a separately fired superheater, and form a horizontal partition wall therein, which is the part most exposed to radiant heat, lar ely of a protected superheater, of the kin above referred to, and above this wall I arrange an ordinary superheater arranged in the path of the hot gases issuing from the first or fire compartment or chamber of the furnace, and flowing upward and transversely over the same to the flue. These super-heaters may be connected up in various ways with the steam space Aof a boiler, that is to say, they may be in series or in multiple therewith, and such connections are not material to my invention provided they be such that both superheaters contribute to the ultimate result of superheating the steam.

I have illustrated my improvement as applied to an oiled fired superheater, but this,

it will be understood, is not of the essence of the invention, as any other source of heat may vbe employed. I have also shown a special form of superheater, but this is only because that shown has been practically demonstrated to be most highly eiicient and useful.

Certain .features of the present invention are applicable to heaters in which a medium other than steam is heated.

In the drawing, Fig. l is a view in side elevation of the complete structure.

Fig. 2 is an end elevation of the same.

Fig. 3 is a vertical central longitudinal section.

' Fig. 4 is a horizontalsection, and

Fig. 5 is a vertical cross sectional view on two planes.

The structure is built up in the usual manner as a furnace with brick walls 1 suitably heat insulated in any approved manner, and having an opening in its front wall near the bottom'of the fire chamber through which enters an oil burner 2.

The interior of the furnace is formed with two compartments, an upper or gas chamber and a lower or fire chamber, by means of a protected superheater comprising longitudinal horizontal tubes 3 enclosed in cast ir'n sections 4, the said sections at proper intervals being formed or provided with projections are suspended from a transverse supporting beam 5, and above the protected tubes a wall of refractory material' 6 which completes the partition which in this case is the ceiling of the lower compartment.

Above this superheater containing partition, and in the upper communicating compartment of the 'furnace is supported any desired form of ordinary superheater that shown comprising a series of inverted U- or eyes byy means of which they is tempered by the absorption of heat by the y tubes 7. These are supported by transverse beams of suitable characterv and are provided with proper braces, and in general the structure is equipped with the usual means for supporting and strengthening 1ts parts, and with the usual hand holes, doors and other ydevices for facilitating access to its interior.

The passage for the hot ases is 1ongitudi nally across the lower or re compartment, upward around a vertical wall 8 at the end ofthe lowei` superheater, and transversely' inthe opposite direction through the upper or gas' compartment and over the superheater tubes 7 to the outlet or flue 9.

As I have stated above,the special manner of connecting up either or both of the superheaters is largely immaterial. They may be in series or parallel or partly in either of these relations, as may be preferable, and no lnew or unusual means are required for this purpose. The lower superheater is mainly yaffected by the radiant heat, while that in the upper compartment is wiped by the hot gases' on their path to the flue. As constructed and arranged` no part of thevsuperheater as a whole is liable to injury from excessive heat, and this without regard to the velocity of the steam through the tubes.

The device has a high efficiency, is capable of producing a very high degree of superheat, and these results are attributable to the combination of the two forms or kinds of superheater, which neither could effect by itself. f

The tubes 3 form one heat absorbing sur- Yface of the heater and this surface is adapted to withstand but yet to absorb radiant heat from the fire chamber by reason of Vthe protective coverings 4. Tubes 7 constitute a second heat absorbing surface and the absorption of heat in this part of the heater first mentioned heating surface. The partltion wall between the two surfaces serves as a screen vfor the upper surface and protects the same against direct and high intensity radiant heat of the fire chamber.

What I claim as my invention is:

1. The combination with thefurnace of a separately fired superheater divided into two compartments', of a superheater constituting a partl of the partit-ion wall between the two compartments and the surface of which is .heating gases leaving the fire chamber, of' a Huid container absorbing the major portion of the available heat of the furnace and consisting of two sections, one of which is formed by pipes exposed to and designed to receive radiant heat direct from the fire chamber in amount sufiicient to substantially lower the temperature of the gases passing fro-m the fire chamber to the other compartment, said pipes being surrounded by a metallic casing to strengthen the pipes and increase the amount of heat absorbed by the fluid passing through the pipes, the other of said sections being formedby pipes disposed `in said other compartment and receiving heat mainly by contact with the heating gases passing over them, and connection between the two sections through which the Huid heated passes from one section to the other.

In testimony whereof I hereunto aix my signature. l A- v,ro-nu E. BELL. 

